Qualitat

Difference Between HVC and other High Voltage Capacitors.

Qualitat;column will be most interested and mostly concern by serious newfriends!
A continuació es presenten les principals explicació dels paràmetres tècnics importants:

Resistència d'aïllamentor IR as the name suggests is the resistance oftheinsulation.IR actually
protects electrical equipment from short circuit.IR valuesare generally very high in therange of Mega-ohm or Mohm.

Coeficient de temperaturadepends on whether the dielectric isClass 1orClass 2. A ceramic
capacitor (especially the class 2) often has highdissipation factor, high frequency coefficient ofdissipation.

Factor de dissipació (tan δ):or DF is defined as the ratio of the ESR and capacitive reactance.It is the
dissipation factor is alsoknown as the tangent of the loss angle and is commonly expressed in percent.
Recognized standards express the dissipation factor at specific frequenciestypically 120Hz for Aluminum
electrolytic and Tantalum capacitors while for film capacitors is 1 kHzand 1 MHz for ceramic capacitors.

Partial Discharge (PD):is an electrical discharge or spark that bridges a small portion of the insulation
dur a terme entre dos electrodes.PD pot ocórrer en qualsevol punt en el sistema d'aïllament, on el camp elèctric
força supera la resistència desglossament d'aquesta porció de la material.PD aïllant pot ocórrer en buits dins de
aïllament sòlid, a través de la superfície del material aïllant a causa dels contaminants o irregularitats, dins de les bombolles de gas
en l'aïllament de líquid o al voltant d'un elèctrode en gas (activitat corona).

Material dielèctric:

For example, a Z5U capacitor will operate from +10 °C to +85 °C with a capacitance change of at most +22% to −56%. An X7R capacitor will operate from −55 °C to +125 °C with a capacitance change of at most ±15% .HVC's N4700 Dielectric Material: similar to other company, electroceramicsdetermine the major feature of the caps. HVC spend 3 years and millions of $ to inventpatented strontium titanate , which is N4700 type.ThisN4700 material provide a very good high frequency feature , excellent huge insulation resistance and tinydissipation factor and super long life up to 20 years.

Especificació Tècnica Comparació:
Per fer conèixer els articles de HVC en profunditat, mostrem les especificacions tècniques de HVC en comparació amb les diferents existents
marca d'Europa i Nord Amercia.

Amercian Marca E *****
They offer only ceramic disc caps, offer same to HVC's dielectric material X5F.
dissipation Factor for X5F is 1.5%;
HVC X5F component can be Dissipation Factor value to 1%.

Maximun espectacle de tensió en el catàleg 30Kv, 2200pf;
Espectacle de HVC al catàleg (producció habitual) 50Kv, 3300pf.

Flash Proves 130% de la tensió nominal, com 30Kv, flash test sigui 40KvDc.
La força dielèctrica de HVC pot ser del 150% al 200%, vol dir que, mentre es diu que la tensió nominal és de 30Kv, les proves de flaix poden suportar
45Kv a 60KvDc.

Característiques de temperatura: (NP0 de Z5U)
HVC’s temperate characterstics : (N4700,Y5T,Y5U)

Marca G Europea ******:
Theyoffer only doorknob capacitor.
10Kv max capacitància 8000pf, mentre HVC ésser mateix 8000pf, mateix material tipus N4700;
20kv max capacitància 4000pf, mentre que HVC pot ser 10000pf;
30kv max capacitància 2700pf, mentre que HVC pot ser 3300pf;
40kv max capacitància 2000pf, mentre HVC ésser mateix 2000pf;
50kv max capacitància 1700pf, mentre que HVC pot ser 15000pf (Y5V) i 5000pf (Y5T).

G******:use N4700 material, Dissipation Factor be 0.3% max,while HVC always be around 0.1% and never higher
que 0.2%
G******:Insulation resistance 10,000mOhm(N4700) min, while HVC most time can be 200,000mOhm(N4700) min.

American Popular Brand H**:
Theyoffer only door knob capacitor, wildly use in North Amercian market.

No conèixer el material dielèctric, el valor del factor de dissipació sigui 0.5 max%, mentre que HVC majorment utilitzen N4700 dielèctrica
materials, factor de dissipació sigui única 0.1% a 0.2%, la major part de temps només 0.1%.

North American Famous Brand H***:
They widely sold in NorthAmerica,Russia,Japan etc.offer both ceramic disccapacitor anddoor knob capacitor.
For ceramic disc caps,only Y5P,Y5U dieletric materialavailable,those offer not so good temperature coefficient,while
HVC oferta N4700 de tapes de discos ceràmics.

Highest voltage capacitanceavailability, H*** show is 20Kv 4700pf(Y5U),while HVC offer 50KV 3300pf(Y5T).
La resistència de l’aïllament és mínima de 1000 mOhm, mentre que l’IR de HVC pot ser de 10 000 mOhm
El factor de dissipació és del 5% màxim (Y5P), mentre que el DF màxim de HVC és del 2% (Y5U, Y5V)

European Brand M*****:
World famous company, offer doorknob capacitorin different range,dieletric material in Y5U andN4700 level.
This big name’s product very concern to partial dischargevalue,their item can be very low pc on rated
AC voltage,While HVC offer nearlly same quality level of lowpC.
Partial Discharge value beN4700 material with Insulation Resistance>=1011ohm ,While HVC’s own N4700 material be double,min 2x1011ohm

Japanese World Famous Brand T**:
This manufacturer is world class passive component manufacturer, with quite a lot different production
plant inthe world, they also produce door knobcapacitor,and invent their own ceramic material.dieletric material
be Z5T,Y5P andY5S, those all only soso temperature coefficients,they don’t have N4700material level,which
offer the high frequency and high dielectric strength function. Even moreY5S is a kinds of material not PB free.
But comply toRoHS “EU Directive2002/95/EC, lead,cadmium, mercury, hexavalent chromium, and specific
bromine-based flame retardants, PBB and PBDE,have not been used, except for exempted applications” forhigh
voltage application, not need be lead free.But not leadfreeitem can’t accpet by the some serious client.Biggest
voltage capacitance rate only 50kv 2100pf,but cansee 20kvAC 1080p,this 20kvAC can be roughly equal to80kvDC.
While HVC now able to make150kvDc(50kvAC),800pf item, we HVC have higherproduction abilityfor higher end
application.Insulation Resistance be 100,000mOhm min,while HVC’s max I.R is double,min in 200,000mOhm.

Comparació de preus per l'HVC i Altres:
From above we know HVC’s quality level is quite high, we are among thesame quality levelof world famous brand
Vishay,TDK,Murata,Morganetc… And we are sure in 20% to 30% lower cost in general.

Termini d'obtenció de comparació de HVC i Altres:
HVC's standard production lead time for door knob capacitor be 60 days (8 weeks),while normallytop brands need14 week
Flexibilitat Comparació de HVC i Altres:
HVC's capacitor also offer flexible type component, like GIS (GasInsulated Switchgear)customer,theyusuallyneed a smaller
size of high cap, we offernon-encapsulation cap to meet strictrequirement. Whileother manufacturernot flexible likeus,or ask for quite big MOQ.